Phase relations, crystal structure, and phase transformation of In1−xNb1−xTi2xO4 (0 ≤ x < 0.45) in In2O3–Nb2O5–TiO2 system

• Published in: Journal of alloys and compounds Vol. 651; pp. 97 - 105
• Main Authors: Su, Liumei, Fan, Xing, Cai, Gemei, Liu, Huashan, Jin, Zhanpeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.12.2015
• Subjects: Crystal structure; In2O3–Nb2O5–TiO2 ternary system; Phase relation; Phase transformation; Structure refinement; Phase relation; Phase transformation; In2O3–Nb2O5–TiO2 ternary system; Structure refinement; Crystal structure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2015.08.086

Phase relations, crystal structures, and phase transformation of In1−xNb1−xTi2xO4 (0 ≤ x < 0.45) in In2O3–Nb2O5–TiO2 ternary system were investigated for the first time. A number of samples with different compositions were prepared by a solid-state reaction method, and phase assembles were analyzed by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe micro-analysis (EPMA). Five three-phase regions, ten two-phase regions, and six single-phase solid solutions were determined in this system. The solid solution of In1−xNb1−xTi2xO4 (0 ≤ x < 0.45) is composed of both ordered monoclinic wolframite-type structure (0 ≤ x < 0.35) and disordered orthorhombic α-PbO2 type structure (0.35 < x < 0.45). Driving force for composition-driven phase transformation in In1−xNb1−xTi2xO4 (0 ≤ x < 0.45) stems from the ordering of cations. The ever reported compound InNbTiO6 with an orthorhombic α-PbO2 type structure was amended to be a monoclinic wolframite-type structure. Present investigations will be useful for the whole ceramic community working with In2O3–Nb2O5–TiO2 ternary system as well as for the development of functional materials. [Display omitted] •Phase relations of In2O3–Nb2O5–TiO2 ternary system were constructed.•Crystal structures of a novel solid solution In1−xNb1−xTi2xO4 were determined.•Crystal structure of InNbTiO6 was amended to be a wolframite-type structure.•Composition-driven phase transformation of In1−xNb1−xTi2xO4 was investigated.